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@article{JRAM_1970__245_151070, author = {Clifton Whyburn}, title = {The distribution of r-th powers in a finite field.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {183--187}, publisher = {mathdoc}, volume = {245}, year = {1970}, zbl = {0205.35504}, url = {http://geodesic.mathdoc.fr/item/JRAM_1970__245_151070/} }
Clifton Whyburn. The distribution of r-th powers in a finite field.. Journal für die reine und angewandte Mathematik, Tome 245 (1970), pp. 183-187. http://geodesic.mathdoc.fr/item/JRAM_1970__245_151070/